Q. A crowbar circuit is generally needed for protection under fault conditions.

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Q. Forward dv/dt rating of an SCR is

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Q. The number of leads in a DIAC are

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Q. The method of triggering SCS is

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Q. Assertion (A): A class C chopper can operate in first and second quadrants

Reason (R): A class B chopper operates only in second quadrant.

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Q. A single phase dual converter consists of

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Q. The snubber circuit consists of

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Q. The effect of source inductance in a 3 phase fully controlled bridge converter is to

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Q. In disc mounting of SCR

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Q. Assertion (A): Thyristors can be used in controlled heating, excitation systems of alternators, speed control of motors and HVDC

Reason (R): A static var system using thyristors is very commonly used in high voltage ac systems.

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Q. In a dual converter operated in circulating current mode, the circulating current flows

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Q. A class B chopper operates in third quadrant.

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Q. In a full bridge circuit supplying an RLC under damped circuit

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Q. In a single phase half wave ac regulator feeding a resistive load, the rms load current

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Q. In a bridge inverter with single pulse width modulation

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Q. In a modified series inverter with two inductors and two capacitors, the load current

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Q. The number of layers in a Shockley diode are

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Q. The load circuit of a single phase full bridge inverter

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Q. When an SCR is reverse biased

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Q. A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

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